| Dxvideo |
Hi all,
I want to build a simple 5.1 gainclone with 2 TDA7370s... Each channel (except subwoofer) will be 7W (%10THD) and sub will be 24W. That gc will be used for a cheap DVD's analog 5.1 output.
The question is; do I need a low pass filter and/or a preamplifier for subwoofer input?
Thanks for your interest in advance.. |
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| abid_rehan |
| quote: | | That gc will be used for a cheap DVD's analog 5.1 output. |
Well I guess in such a case you wont be needing a LPF as DVD's analogue out at subwoofer has already LPF. |
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| matjans |
it does have a LPF but often it's filtered way to high...
I used a passive 100Hz LPF and that sounds way better... |
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| Dxvideo |
| Thank you very much.... I will finish the project in this week. The main problem is volume control... I guess I will use four seperated pot.. |
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| macboy |
| For volume control, try the National LM1036. This IC controls the volume, bass, treble, and balance of 2 channels using DC voltages to control each of those parameters. You can use three of them for 6 channels, using the same voltage to to control the volume on all of them. This chip will add a very small amount of distortion, but it doesn't seem like you are shooting for stellar sound quality to begin with. |
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